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• How can I forward an application with X11 in grayscale

  - by ??????? ???????????

  I am trying to run a graphical application at home and display it on a it on a laptop which is located about six routing hops away. The problem is that the connection is so slow (or rather there is so much GOOEY being transfered) that the mouse is unresponsive and it takes a "long time" to redraw the window even at a resolution of 800x600 pixels. The connection speeds are 10MBit up at home and about 1MBit down on the laptop, which I think should be sufficient for looking at some GUI in (almost) real time. Since this traffic is sent over over a secure shell, I have enabled Compression with highest CompressionLevel along with Ciphers set to blowfish-cbc. This has substantially improved the responsiveness of the application, making it nearly usable. However, my goal is to improve the performance even further by sacrificing colors and even frame rate. The application to be displayed a Qemu SDL window with a graphically-oriented OS in it. This is not strictly relevant, but perhaps there are options to tweak the SDL output which I am not aware of. A possible workaround would be to run the application in a "hidden" X server and enabling TigerVNC on that X server. This would automatically give me the benefits of an optimized VNC viewport, but the goal is to do without (reduce complexity). The question I'm asking is what are my options for reducing the data-rate generated on the server in order to make the graphical application more usable on the client. As mentioned, colors are not important and I could probably work with 5-16 fps. Both machines are running Gentoo with the software in question being: workstation X.Org X Server 1.10.4 OpenSSH_5.8p1-hpn13v10, OpenSSL 1.0.0e QEMU emulator version 0.15.1 (qemu-kvm-0.15.1) laptop X.Org X Server 1.12.2 OpenSSH_5.8p1-hpn13v10lpk, OpenSSL 1.0.0j

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• PostgreSQL lots of writes

  - by strife911

  Hi, I am using postgreSQL for a scientific application (unsupervised clustering). The python program is multi-threaded so that each thread manages its own postmaster process (one per core). Hence, their is a lot of concurrency. Each thread-process loop infinitely though two SQL queries. The first is for reading, the second is for writing. The read operation considers 500 time the amount of rows the write operation considers. Here is the output of dstat: ----total-cpu-usage---- ------memory-usage----- -dsk/total- --paging-- --io/total- usr sys idl wai hiq siq| used buff cach free| read writ| in out | read writ 4 0 32 64 0 0|3599M 63M 57G 1893M|1524k 16M| 0 0 | 98 2046 1 0 35 64 0 0|3599M 63M 57G 1892M|1204k 17M| 0 0 | 68 2062 2 0 32 66 0 0|3599M 63M 57G 1890M|1132k 17M| 0 0 | 62 2033 2 1 32 65 0 0|3599M 63M 57G 1904M|1236k 18M| 0 0 | 80 1994 2 0 31 67 0 0|3599M 63M 57G 1903M|1312k 16M| 0 0 | 70 1900 2 0 37 60 0 0|3599M 63M 57G 1899M|1116k 15M| 0 0 | 71 1594 2 1 37 60 0 0|3599M 63M 57G 1898M| 448k 17M| 0 0 | 39 2001 2 0 25 72 0 0|3599M 63M 57G 1896M|1192k 17M| 0 0 | 78 1946 1 0 40 58 0 0|3599M 63M 57G 1895M| 432k 15M| 0 0 | 38 1937 I am pretty sure I could write more often than that for I have seen it write up to 110-140M on dstat. How can I optimize this process?

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• Problems configuring an SSH tunnel to a Nexentastor appliance for use with headless Crashplan

  - by Rob Smallshire

  Problem I am attempting to configure an SSH tunnel to a NexentaStor appliance from either a Windows or Linux computer so that I can connect a Crashplan Desktop GUI to a headless Crashplan server running on the Nexenta box, according to these instructions on the Crashplan support site: Connect to a Headless CrashPlan Desktop. So far, I've failed to get a working SSH tunnel from from either either a Windows client (using Putty) or a Linux client (using command line SSH). I'm fairly sure the problem is at the receiving end with NexentaStor. A blog article - CrashPlan for Backup on Nexenta - indicates that it could be made to work only after "after enabling TCP forwarding in Nexenta in /etc/ssh/sshd_config" - although I'm not sure how to go about that or specifically what I need to do. Things I have tried Ensuring the Crashplan server on the Nexenta box is listening on port 4243 $ netstat -na | grep LISTEN | grep 42 127.0.0.1.4243 *.* 0 0 131072 0 LISTEN *.4242 *.* 0 0 65928 0 LISTEN Establishing a tunnel from a Linux host: $ ssh -L 4200:localhost:4243 admin:10.0.0.56 and then, from another terminal on the Linux host, using telnet to verify the tunnel: $ telnet localhost 4200 Trying ::1... Connected to localhost. Escape character is #^]'. with nothing more, although the Crashplan server should respond with something. From Windows, using PuTTY have followed the instructions on the Crashplan support site to establish an equivalent tunnel, but then telnet on Windows gives me no response at all and the Crashplan GUI can't connect either. The PuTTY log for the tunnelled connection shows reasonable output: ... 2011-11-18 21:09:57 Opened channel for session 2011-11-18 21:09:57 Local port 4200 forwarding to localhost:4243 2011-11-18 21:09:57 Allocated pty (ospeed 38400bps, ispeed 38400bps) 2011-11-18 21:09:57 Started a shell/command 2011-11-18 21:10:09 Opening forwarded connection to localhost:4243 but the telnet localhost 4200 command from Windows does nothing at all - it just waits with a blank terminal. On the NexentaStor server I've examined the /etc/ssh/sshd_config file and everything seems 'normal' - and I've commented out the ListenAddress entries to ensure that I'm listening on all interfaces. How can I establish a tunnel, and how can I verify that it is working?

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• Why are UDP messages from outside the network received but not delivered?

  - by Warren Pena

  I have an Ubuntu Server 10.04 application I've developed that receives messages over a UDP port. The ultimate purpose of this application is to receive messages sent from workers' 3G modems out in the field. If use netcat on either another ubuntu Server or my Vista laptop (both on the same LAN as my test machine) to send a message, the message arrives correctly and appears in my application. However, if I go out to my car and use its 3G modem to send a message from the same Vista laptop, it doesn't work. If I run tcpdump -A, I see the message arrive correctly, but it's never delivered to my application. Clearly, the OS is the one making the choice not to deliver the messages (else they wouldn't appear in tcpdump nor would my app receive them when coming from local machines). I have not installed any firewall software on this machine, nor am I aware of anything installed by default that would block the traffic. sudo iptables --list returns Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I'm not too familiar with iptables, but it looks to me like that's telling it to not do anything. What could be going on that's preventing my messages from being delivered?

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• Get-ChildItem fails to connect in SQLSERVER drive

  - by Norman Kelm

  I'm having some trouble with the SQLSERVER PSDRIVE. See error below. I only have named instances on my PC, both 2005 and 2008 Added the SQL snapins. The PC is named YODA The SQL instance is SQL2008 Navigate to the Databases folder for YODA\SQL2008. You can see the path below. dir -name spits out a connection error trying to connect to YODASQL2008\DEFAULT when it should be trying to connect to YODA\SQL2008. Then it outputs the db name which is Twitter in this case. Is there something missing from my config? Output: PS SQLSERVER:\SQL\YODA\SQL2008\Databases dir -name Get-ChildItem : SQL Server PowerShell provider error: Could not connect to 'YODASQL2008\DEFAULT'. [Failed to connect to server YODASQL2008. -- A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)] At line:1 char:4 + dir <<<< -name + CategoryInfo : OpenError: (SQLSERVER:\SQL\...tabases\Twitter:SqlPath) [Get-ChildItem], GenericProviderException + FullyQualifiedErrorId : ConnectFailed,Microsoft.PowerShell.Commands.GetChildItemCommand Twitter Repeats with error for every database. Thanks, Norman

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• scp error: "Permission denied (publickey). lost connection"

  - by Winston C. Yang

  I tried to scp an svn dump to savannah, but I got the following error at the end. Permission denied (publickey). lost connection The scp command and verbose output are below. Any ideas? [wcyang@be2-wireless-pittnet-60-37 ~]$ scp -v diffcolor-dump.bz2 [email protected]:/srv/download/diffcolor/ Executing: program /usr/bin/ssh host dl.sv.gnu.org, user wcyang, command scp -v -t /srv/download/diffcolor/ OpenSSH_5.2p1, OpenSSL 0.9.7l 28 Sep 2006 debug1: Reading configuration data /etc/ssh_config debug1: Connecting to dl.sv.gnu.org [140.186.70.73] port 22. debug1: Connection established. debug1: identity file /Users/wcyang/.ssh/identity type -1 debug1: identity file /Users/wcyang/.ssh/id_rsa type 1 debug1: identity file /Users/wcyang/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5 debug1: match: OpenSSH_5.1p1 Debian-5 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'dl.sv.gnu.org' is known and matches the RSA host key. debug1: Found key in /Users/wcyang/.ssh/known_hosts:1 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: /Users/wcyang/.ssh/identity debug1: Offering public key: /Users/wcyang/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Trying private key: /Users/wcyang/.ssh/id_dsa debug1: No more authentication methods to try. Permission denied (publickey). lost connection

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• SSI includes not working on Debian with Apache

  - by Mike

  I'm trying to get SSI to work on Debian running Apache, however the .shtml files are not being parsed. From a PHP file with phpinfo() I can see that the following show up in the loaded modules section: mod_mime_xattr mod_mime mod_mime_magic In /etc/apache2/mods-enabled/mime.conf I have (among other things): AddType text/html .shtml AddOutputFilter INCLUDES .shtml In /etc/apache2/sites-enabled/domain.com.conf (for the virtual host in question) I have: <Directory /home/username/public_html> Options +Includes allow from all AllowOverride All </Directory> and for good measure, I added the following as well: <Directory /> Options +Includes </directory> In the user's .htaccess file, I tried adding: Options +Includes AddType text/html shtml AddHandler server-parsed shtml Nothing seems to work. How can I even debug this? Edit: Here is the output of ls /etc/apache2/mods-enabled/ in case this helps actions.conf dav_svn.load proxy_balancer.load actions.load deflate.conf proxy.conf alias.conf deflate.load proxy_connect.load alias.load dir.conf proxy_http.load auth_basic.load dir.load proxy.load auth_digest.load env.load python.load authn_file.load fcgid.conf reqtimeout.conf authz_default.load fcgid.load reqtimeout.load authz_groupfile.load mime.conf rewrite.load authz_host.load mime.load ruby.load authz_user.load mime_magic.conf setenvif.conf autoindex.conf mime_magic.load setenvif.load autoindex.load mime-xattr.load ssl.conf cgi.load negotiation.conf ssl.load dav_fs.conf negotiation.load status.conf dav_fs.load php5.conf status.load dav.load php5.load suexec.load dav_svn.conf proxy_balancer.conf

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• Why RSA SSH authentication only works after console log-in?

  - by smorhaim

  I setup RSA authentication on one of my Ubuntu servers, however after every restart, I can't log-in via ssh RSA. In order to log-in with ssh I need to first log-in via console, then the RSA starts working. Why??? Below are my sshd config file as well as an output from the ssh -vv command before console log-in and after. . Before console log-in: debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/smorhaim/.ssh/smorhaim (0x7ff8d8c242c0) debug2: key: /Users/smorhaim/.ssh/id_rsaadmin (0x7ff8d8c24cf0) debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/smorhaim/.ssh/smorhaim debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey debug1: Offering RSA public key: /Users/smorhaim/.ssh/id_rsaadmin debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey debug2: we did not send a packet, disable method debug1: No more authentication methods to try. Permission denied (publickey). After console log-in: debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/smorhaim/.ssh/smorhaim (0x7f91c14242c0) debug2: key: /Users/smorhaim/.ssh/id_rsaadmin (0x7f91c1424ae0) debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/smorhaim/.ssh/smorhaim debug2: we sent a publickey packet, wait for reply debug1: Server accepts key: pkalg ssh-rsa blen 279 debug2: input_userauth_pk_ok: fp b1:d5:90:43:be:43:52:a9:7f:05:c7:04:86:57:b3:ff debug1: Authentication succeeded (publickey). Authenticated to 10.10.30.151 ([10.10.30.151]:22). sshd config: Port 22 Protocol 2 ListenAddress 10.10.30.151 UsePrivilegeSeparation yes SyslogFacility AUTHPRIV PermitRootLogin no PasswordAuthentication no ChallengeResponseAuthentication no UsePAM yes X11Forwarding yes

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• ip-up does not trigger when using built-in cisco vpn on mac osx lion

  - by Yasser Sobhdel

  I am using Cisco VPN client over lion and I want to make the ip-up and ip-down work. There is no sign of any action taken when I connect or disconnect this VPN connection. I really doubt whether the syntax has been changed or even this kind if connection is triggering the ip-up. Logically, it must be set over ppp but when using the following codes and instructions on them, there is no sign of any output in the log file: http://www.macfreek.nl/mindmaster/Modify_PPTP_Routing_Table http://www.aidanfindlater.com/use-vpn-for-specific-sites-on-mac-os-x Going for error, which there is no sign of it, using the following page: http://hints.macworld.com/article.php?story=20060616150640529 I couldn't find the /var/log/ppp/vpnd.log log file. Also the files are given full permission 0755 or a+x or even 777 using the following command: sudo chmod a+x /etc/ppp/ip-up Any clue on how to debug this would be appreciated. I am totally confused, netstat -rn -f inet doesn't show the routes. Even when the routes are added manually, closing the VPN connection does not run the ip-down and the routes must be deleted manually.

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• Sun Solaris - Find out number of processors and cores

  - by Adrian

  Our SPARC server is running Sun Solaris 10; I would like to find out the actual number of processors and the number of cores for each processor. The output of psrinfo and prtdiag is ambiguous: $psrinfo -v Status of virtual processor 0 as of: dd/mm/yyyy hh:mm:ss on-line since dd/mm/yyyy hh:mm:ss. The sparcv9 processor operates at 1592 MHz, and has a sparcv9 floating point processor. Status of virtual processor 1 as of: dd/mm/yyyy hh:mm:ss on-line since dd/mm/yyyy hh:mm:ss. The sparcv9 processor operates at 1592 MHz, and has a sparcv9 floating point processor. Status of virtual processor 2 as of: dd/mm/yyyy hh:mm:ss on-line since dd/mm/yyyy hh:mm:ss. The sparcv9 processor operates at 1592 MHz, and has a sparcv9 floating point processor. Status of virtual processor 3 as of: dd/mm/yyyy hh:mm:ss on-line since dd/mm/yyyy hh:mm:ss. The sparcv9 processor operates at 1592 MHz, and has a sparcv9 floating point processor. _ $prtdiag -v System Configuration: Sun Microsystems sun4u Sun Fire V445 System clock frequency: 199 MHZ Memory size: 32GB ==================================== CPUs ==================================== E$ CPU CPU CPU Freq Size Implementation Mask Status Location --- -------- ---------- --------------------- ----- ------ -------- 0 1592 MHz 1MB SUNW,UltraSPARC-IIIi 3.4 on-line MB/C0/P0 1 1592 MHz 1MB SUNW,UltraSPARC-IIIi 3.4 on-line MB/C1/P0 2 1592 MHz 1MB SUNW,UltraSPARC-IIIi 3.4 on-line MB/C2/P0 3 1592 MHz 1MB SUNW,UltraSPARC-IIIi 3.4 on-line MB/C3/P0 _ $more /etc/release Solaris 10 8/07 s10s_u4wos_12b SPARC Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms. Assembled 16 August 2007 Patch Cluster - EIS 29/01/08(v3.1.5) What other methods can I use? EDITED: It looks like we have a 4 processor system with one core each: $psrinfo -p 4 _ $psrinfo -pv The physical processor has 1 virtual processor (0) UltraSPARC-IIIi (portid 0 impl 0x16 ver 0x34 clock 1592 MHz) The physical processor has 1 virtual processor (1) UltraSPARC-IIIi (portid 1 impl 0x16 ver 0x34 clock 1592 MHz) The physical processor has 1 virtual processor (2) UltraSPARC-IIIi (portid 2 impl 0x16 ver 0x34 clock 1592 MHz) The physical processor has 1 virtual processor (3) UltraSPARC-IIIi (portid 3 impl 0x16 ver 0x34 clock 1592 MHz)

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• apache vhost not working consistently

  - by petrus

  I have a vhost on my webserver whose sole and unique goal is to return the client IP adress: petrus@bzn:~$ cat /home/vhosts/domain.org/index.php <?php echo $_SERVER['REMOTE_ADDR']; echo "\n" ?> This helps me troubleshoot networking issues, especially when NAT is involved. As such, I don't always have domain name resolution and this service needs to work even if queried by its IP address. I'm using it this way: petrus@hive:~$ echo "GET /" | nc 88.191.124.41 80 191.51.4.55 petrus@hive:~$ echo "GET /" | nc domain.org 80 191.51.4.55 router#more http://88.191.124.41/index.php 88.191.124.254 However I found that it wasn't working from at least a computer: petrus@seth:~$ echo "GET /" | nc domain.org 80 petrus@seth:~$ petrus@seth:~$ echo "GET /" | nc 88.191.124.41 80 petrus@seth:~$ What I checked: This is not related to ipv6: petrus@seth:~$ echo "GET /" | nc -4 ydct.org 80 petrus@seth:~$ petrus@hive:~$ echo "GET /" | nc ydct.org 80 2a01:e35:ee8c:180:21c:77ff:fe30:9e36 netcat version is the same (except platform, i386 vs x64): petrus@seth:~$ type nc nc est haché (/bin/nc) petrus@seth:~$ file /bin/nc /bin/nc: symbolic link to `/etc/alternatives/nc' petrus@seth:~$ ls -l /etc/alternatives/nc lrwxrwxrwx 1 root root 15 2010-06-26 14:01 /etc/alternatives/nc -> /bin/nc.openbsd petrus@hive:~$ type nc nc est haché (/bin/nc) petrus@hive:~$ file /bin/nc /bin/nc: symbolic link to `/etc/alternatives/nc' petrus@hive:~$ ls -l /etc/alternatives/nc lrwxrwxrwx 1 root root 15 2011-05-26 01:23 /etc/alternatives/nc -> /bin/nc.openbsd It works when used without the pipe: petrus@seth:~$ nc domain.org 80 GET / 2a01:e35:ee8c:180:221:85ff:fe96:e485 And the piping works at least with a test service (netcat listening on 1234/tcp and output to stdout) petrus@bzn:~$ nc -l -p 1234 GET / petrus@bzn:~$ petrus@seth:~$ echo "GET /" | nc domain.org 1234 petrus@seth:~$ I don't know if this issue is more related to netcat or Apache, but I'd appreciate any pointers to troubleshoot this issue ! The IP addresses have been modified but kept consistent for easy reading. bzn is the server, hive is a working client and seth is the client on which I have the issue.

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• Unable to connect Xend with virt-manager

  - by Majid Azimi

  I have installed debian 6.0.1a. I have install all XEN stuff. including xen kernel, libvirtd, ... but when i want to connect xend, virt-manager shows me this: Verify that: A Xen host kernel was booted The Xen service has been started details: Unable to open connection to hypervisor URI 'xen:///': unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: Permission denied Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/connection.py", line 971, in _try_open None], flags) File "/usr/lib/python2.6/dist-packages/libvirt.py", line 111, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirtError: unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: Permission denied here is uname output: Linux debian 2.6.32-5-xen-amd64 #1 SMP Tue Mar 8 00:01:30 UTC 2011 x86_64 GNU/Linux and also xend and libvirtd is runnig: root@debian:/home/mazimi# /etc/init.d/libvirt-bin status Checking status of libvirt management daemon: libvirtd running. root@debian:/home/mazimi# /etc/init.d/xend start Starting Xen daemons: xenstored xenconsoled xend. permissions for livbirt-sock: root@debian:/home/mazimi# ls -alih /var/run/libvirt/ total 12K 671017 drwxr-xr-x 3 root root 4.0K Apr 15 13:54 . 654083 drwxr-xr-x 18 root root 4.0K Apr 15 13:54 .. 670901 srwxrwx--- 1 root libvirt 0 Apr 15 13:54 libvirt-sock 670928 srwxrwxrwx 1 root libvirt 0 Apr 15 13:54 libvirt-sock-ro 670870 drwxr-xr-x 2 root root 4.0K Apr 15 02:34 qemu and also we have group named libvirt in /etc/group When running libvirtd with verbose mode it behaves kind of stange: root@debian:/var/log/libvirt# /usr/sbin/libvirtd --verbose 17:26:55.841: warning : qemudStartup:1832 : Unable to create cgroup for driver: No such device or address 17:26:56.128: warning : lxcStartup:1900 : Unable to create cgroup for driver: No such device or address and waits infinitely.

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• LDAP change user pass on client

  - by Sean

  I am trying to allow ldap users to change their password on client machines. I have tried pam every which way I can think of /etc/ldap.conf & /etc/pam_ldap.conf, as well. At this point I'm stuck. Client: Ubuntu 11.04 Server: Debian 6.0 The current output is this: sobrien4@T-E700F-1:~$ passwd passwd: Authentication service cannot retrieve authentication info passwd: password unchanged /var/log/auth.log gives this during the command: May 9 10:49:06 T-E700F-1 passwd[18515]: pam_unix(passwd:chauthtok): user "sobrien4" does not exist in /etc/passwd May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: ldap_simple_bind Can't contact LDAP server May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: reconnecting to LDAP server... May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: ldap_simple_bind Can't contact LDAP server getent passwd |grep sobrien4 (note keeping short since testing with that account, however it outputs all ldap users): sobrien4:Ffm1oHzwnLz0U:10000:12001:Sean O'Brien:/home/sobrien4:/bin/bash getent group shows all ldap groups. /etc/pam.d/common-password (Note this is just the most current, I have tried a lot of different options): password required pam_cracklib.so retry=3 minlen=8 difok=3 password [success=1 default=ignore] pam_unix.so use_authtok md5 password required pam_ldap.so use_authtok password required pam_permit.so Popped open wireshark as well, the server & client are talking. I have the password changing working on the server. I.E. the server that runs slapd, I can log in with the ldap user and change the passwords. I tried copying the working configs from the server initially and no dice. I also tried cloning it, and just changing ip & host, and no go. My guess is that the client is not authorized by ip or hostname to change a pass. Pertaining to the slapd conf, I saw this in a guide and tried it: access to attrs=loginShell,gecos by dn="cn=admin,dc=cengineering,dc=etb" write by self write by * read access to * by dn="cn=admin,dc=cengineering,dc=etb" write by self write by * read So ldap seems to be working okay, just can't change the password.

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• mysqladmin - Unknown MySQL server host

  - by ert

  I'm trying to connect to a mysql server over a local network. The server is running and listening to post 41322. dylan~$ netstat -ln | s mysql unix 2 [ ACC ] STREAM LISTENING 41322 /var/run/mysqld/mysqld.sock My user is granted all rights from all addresses, and I can log in locally. dylan~$ mysqladmin -P 41322 -h [email protected] create database test mysqladmin: connect to server at '[email protected]' failed error: 'Unknown MySQL server host '[email protected]' (1)' Check that mysqld is running on [email protected] and that the port is 41322. You can check this by doing 'telnet [email protected] 41322' Adding a --verbose flag gives no additional output. I've commented out bind-address=127.0.0.1 in /etc/mysql/my.cnf on the server. I can ssh into the server without a problem. dylan~$ ps a | grep mysql 11131 pts/3 S 0:00 /bin/sh /usr/bin/mysqld_safe 11170 pts/3 Sl 0:03 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock 11171 pts/3 S 0:00 logger -p daemon.err -t mysqld_safe -i -t mysqld 13710 pts/1 S+ 0:00 grep mysq Any help or thoughts are appreciated.

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• SSH Tunnel for Remote Desktop via Intermediary Server Part II

  - by Mihai Todor

  I asked previously how to configure 2 SSH tunnels using an intermediary server in order to run Remote Desktop through them and I managed to make it work. Now, I'm trying to do the same, using the same machines, but in reverse order. Here's the setup: Windows 7 PC in a private network, sitting behind a firewall. Public access Linux server, which has access to the PC. Windows 7 laptop, at home, on which I wish to do Remote Desktop from the PC. I use Putty on the laptop to create a reverse tunnel from it to the Linux server: R60666 localhost:3389. I use Putty on the PC to create a regular tunnel from it to the Linux server: L60666 localhost:60666. I SSH to the Linux sever and I run telnet localhost 60666 and it seems to produce the expected output, as described in the debugging tips that I received here. I try to connect Remote Desktop from the PC to the laptop: localhost:60666. It asks for my username and password, I click OK and it locks my current session on the laptop (so I see the welcome screen on the laptop instead of my desktop), it shows the "Welcome" message in the Remote Desktop screen and then it just goes black. It doesn't disconnect, it doesn't provide any error and I'm not able to perform any actions in the Remote Desktop screen. I tried the same setup with a Windows XP laptop and I'm experiencing the same symptoms. I also tried to use different ports than 60666, but nothing changed. Does anybody have any idea what I'm doing wrong? Update: As pointed out by @jwinders, I'm not able to run telnet PC 3389 from the Linux server directly. Since Windows Firewall has a rule to allow all connections on port 3389, I have no idea what is blocking it. Fortunately, I'm able to create a SSH tunnel from the Linux machine to the PC ssh 3389:localhost:3389 'domain\user'@PC.

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• MySQL remote access not working - Port Close?

  - by dave.zap

  I am not able to get a remote connection established to MySQL. From my pc I am able to telnet to 3306 on the existing server, but when I try the same with the new server it hangs for few minutes then returns # mysql -utest3 -h [server ip] -p Enter password: ERROR 2003 (HY000): Can't connect to MySQL server on '[server ip]' (110) Here is some output from the server. # nmap -sT -O localhost -p 3306 ... PORT STATE SERVICE 3306/tcp closed mysql ... # netstat -anp | grep mysql tcp 0 0 [server ip]:3306 0.0.0.0:* LISTEN 6349/mysqld unix 2 [ ACC ] STREAM LISTENING 12286 6349/mysqld /DATA/mysql/mysql.sock # netstat -anp | grep 3306 tcp 0 0 [server ip]:3306 0.0.0.0:* LISTEN 6349/mysqld unix 3 [ ] STREAM CONNECTED 3306 1411/audispd # lsof -i TCP:3306 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME mysqld 6349 mysql 10u IPv4 12285 0t0 TCP [domain]:mysql (LISTEN) I am running... OS CentOS release 5.8 (Final) mysql 5.5.28 (Remi) Note: Internal connections to mysql work fine. I have disabled IPtables, the box has no other firewall, it runs Apache on port 80 and ssh no problem. Had followed this tutorial - http://www.cyberciti.biz/tips/how-do-i-enable-remote-access-to-mysql-database-server.html I have bound the IP address in my.cnf user=mysql bind-address = [sever ip] port=3306 I even started over by deleting the mysql folder in my datastore and running mysql_install_db --datadir=/DATA/mysql --force Then recreated all the users as per the manual... http://dev.mysql.com/doc/refman/5.5/en/adding-users.html I have created one test user CREATE USER 'test'@'%' IDENTIFIED BY '[password]'; GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' WITH GRANT OPTION; FLUSH PRIVILEGES; So all I can see is that the port is not really open. Where else might I look? thanks

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• cset as non-root to set cpu affinity for running processes

  - by RaveTheTadpole

  I've been playing with cset to set cpu affinity for running processes. I'm recreating the built-in "shield" function manually with set and proc, to add some subsets for specific threads of my application. I have a bash script that is calling cset to create the sets, and move the correct threads to the correct sets. It works when run with sudo. Now I'd like to make this script executable by another user, who does not have sudo powers. I trust this user enough to be responsible with cset, but don't want to open up the wide powers of root. I thought that CAP_SYS_NICE -- which is needed for sched_setaffinity, which I just assume cset must use -- on the script would be sufficient, but that didn't work. I tried extending CAP_SYS_NICE to the cset program (which is a thin python wrapper for the cset python library). No dice. The output of cap_to_text on my CAP_SYS_NICE'd scripts is "=cap_ipc_lock,cap_sys_nice,cap_sys_resource+eip" (it has ipc_lock and sys_resource for other reasons; I think only sys_nice is relevant). Any ideas?

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• Crash dump analysis

  - by Ryan Ries

  I hope this isn't a stupid question, and if it is, then I want to at least get it over with so I don't feel so dumb in the future. Here we are, loading up a Windows crash dump with Windbg. Here are the first few lines of the debugger output: 0: kd> .dumpdebug ----- 64 bit Kernel Summary Dump Analysis DUMP_HEADER64: MajorVersion 0000000f MinorVersion 00001db1 ... The MinorVersion I mostly understand. It's hexadecimal and it translates to 7601 in decimal. Windows admins would already be able to tell from that that this must be either a Win7 x64 machine or a 2k8 R2 machine with SP1. But isn't 7601 the build number? It's supposed to be Major.Minor.Build/Revision... right? Also I don't understand the MajorVersion. It should be 6. This version of Windows is 6. But isn't 0000000f in hexadecimal 15 in decimal? The full version string of this version of Windows, when you launch the Command Prompt for instance, is 6.1.7601. If 7601 is the MinorVersion, then what is 1 and what is 6? And why does the crash dump say 0F?

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• Cannot connect to my EC2 instance because of "Permission denied (publickey)"

  - by Burak

  In AWS console, I saw that my key pair was deleted. I created a new one with the same name. Then I tried to connect with ssh -v -i sohoKey.pem ec2-user@******.compute-1.amazonaws.com Here's the output: macs-MacBook-Air:~ mac$ ssh -v -i sohoKey.pem ec2-user@******.compute-1.amazonaws.com OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug1: Connecting to ********.compute-1.amazonaws.com [*****] port 22. debug1: Connection established. debug1: identity file sohoKey.pem type -1 debug1: identity file sohoKey.pem-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3 debug1: match: OpenSSH_5.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.6 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host '*******.compute-1.amazonaws.com' is known and matches the RSA host key. debug1: Found key in /Users/mac/.ssh/known_hosts:3 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: sohoKey.pem debug1: Authentications that can continue: publickey debug1: Trying private key: sohoKey.pem debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey). Update: I detached my old EBS and attached to the new instance. Now, how can I mount it?

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• svchost consuming more than 50% CPU all the time in windows 7

  - by claws

  Hello, I'm using windows 7 ultimate. svchost containing DCOM Server Process Launcher Plug and Play Power services is consuming more than 50% of CPU for most of the time. I found this blog post: http://blog.hansmelis.be/2007/06/17/windows-vista-long-delay-when-switching-songs-in-media-player/ That process is associated with two services: DCOM Server Process Launcher and Plug and Play. For the Vulcans among us, all logic stops there for a second. What do those two services have to do with WMP? The answer is provided by Vista's new audio engine. The new engine supports several audio "enhancements". But for the enhancements to work, the engine needs to determine if your hardware is up to the task. And when does it check that? Each time a sound output device is accessed. That's pretty nice if you can do a hot swap of sound hardware, but I don't see me doing that anytime soon. Anyways, it does provide us with the link to the correct service because checking hardware is done by the "Plug and Play" service. One might think that deactivating each enhancement would solve the problem, but that's wishful thinking. The configuration of the enhancements is located in the properties of the sound hardware. When opening the tab, I found out that no enhancements were active. Hmmm... so why does it check the hardware? Well, it does that in case you actually enable an enhancement. To completely stop the hardware checking, you have to tick the box labelled Disable all enhancements. As soon as you do that, Vista finally understands you don't want to use them buts thats for vista. Is it the same case with windows 7 too? and I couldn't find any "Disable all enhancements" in my controlpanelsounds (mmsys.cpl). Where can I find this option in windows 7? How to solve this?

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• Access Control Lists in Debian Lenny

  - by arbales

  So, for my clients to who have sites hosted on my server, I create user accounts, with standard home folders inside /home. I setup an SSH jail for all the collective users, because I really am against using a separate FTP server. Then, I installed ACL and added acl to my /etc/fstab — all good. I cd into /home and chmod 700 ./*. At this point users cannot see into other users home directories (yay), but apache can't see them either (boo) . I ran setfacl u:www-data:rx ./*. I also tried individual directories. Now apache can see the sites again, but so can all the users. ACL changed the permissions of the home folders to 750. How do I setup ACL's so that Apache can see the sites hosted in user's home folders AND 2. Users can't see outside their home and into others' files. Edit: more details: Output after chmod -R 700 ./* sh-3.2# chmod 700 ./* sh-3.2# ls -l total 72 drwx------+ 24 austin austin 4096 Jul 31 06:13 austin drwx------+ 8 jeremy collective 4096 Aug 3 03:22 jeremy drwx------+ 12 josh collective 4096 Jul 26 02:40 josh drwx------+ 8 joyce collective 4096 Jun 30 06:32 joyce (Not accessible to others users OR apache) setfacl -m u:www-data:rx jeremy (Now accessible to members apache and collective — why collective, too?) sh-3.2# getfacl jeremy # file: jeremy # owner: jeremy # group: collective user::rwx user:www-data:r-x group::r-x mask::r-x other::--- Solution Ultimately what I did was: chmod 755 * setfacl -R -m g::--- * setfacl -R -m u:www-data:rx *

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• How to tunnel a local port onto a remote server

  - by Trevor Rudolph

  I have a domain that i bought from DynDNS. I pointed the domain at my ip adress so i can run servers. The problem I have is that I don't live near the server computer... Can I use an ssh tunnel? As I understand it, this will let me access to my servers. I want the remote computer to direct traffic from port 8080 over the ssh tunnel to the ssh client, being my laptop's port 80. Is this possible? EDIT: verbose output of tunnel macbookpro:~ trevor$ ssh -R *:8080:localhost:80 -N [email protected] -v OpenSSH_5.2p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /Users/trevor/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: Connecting to site.com [remote ip address] port 22. debug1: Connection established. debug1: identity file /Users/trevor/.ssh/identity type -1 debug1: identity file /Users/trevor/.ssh/id_rsa type -1 debug1: identity file /Users/trevor/.ssh/id_dsa type 2 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'site.com' is known and matches the RSA host key. debug1: Found key in /Users/trevor/.ssh/known_hosts:9 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/trevor/.ssh/identity debug1: Trying private key: /Users/trevor/.ssh/id_rsa debug1: Offering public key: /Users/trevor/.ssh/id_dsa debug1: Authentications that can continue: publickey,password debug1: Next authentication method: password [email protected]'s password: debug1: Authentication succeeded (password). debug1: Remote connections from *:8080 forwarded to local address localhost:80 debug1: Requesting [email protected] debug1: Entering interactive session. debug1: remote forward success for: listen 8080, connect localhost:80 debug1: All remote forwarding requests processed

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• CentOS 5.5 ext4 conversion problem - ext4 partition is recognized as ext3

  - by FractalizeR

  Hello. I had 5.4 machine. Upgraded to 5.5 today via yum upgrade. All went fine. Rebooted. Wanted to convert root partition to ext4 (I have three partitions: /boot, / and swap). All of them on software RAID 1 (root is /dev/md2). I did the following for converting yum install e4fsprogs tune2fs -O extents,uninit_bg,dir_index /dev/md2 nano /etc/fstab # I indicated here that my /dev/md2 is of ext4 uname -a mkinitrd -f /boot/initrd-2.6.18-194.3.1.el5.img 2.6.18-194.3.1.el5 Rebooted. I expected fsck to start automatically as said on some site. But it did not. Threw some error (don't remember exactly which). Ok, I booted linux rescue and executed fsck: fsck -t ext4 -fy /dev/md2 Partition went fine. But still when I boot main system, it says in log: "ext3-fs:" then something about not being able to mount ext3 partition due to unknown extended attributed (200). I booted linux rescue again. It loads fine and correctly determines all my machine partitions both ext3 (boot) and ext4 (/) under /mnt/sysimage just fine. I retried mkinitrd thing again watching it's output and ensured ext4 module is included into the system. I also edited menu.lst grub file to include rootfstype=ext4 kernel parameter. Bad luck. I still have message from ext3-fs about not being able to mount filesystem because of attributes and kernel panic immediately after. I checked /etc/fstab - it's fine and saying that root is of ext4. What did I do wrong? This machine is empty so I can just reformat it with 5.5 and recreate partitions to be originally ext4. But... I just want to know what did I do wrong.

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• Remote Scripted Installation of Sun/Oracle JRE

  - by chrisbunney

  I'm attempting to automate the installation of a Debian server (debian 6.0 squeeze 64bit). Part of the installation requires the Sun JRE package to be installed. This package has a licence agreement, which has to be accepted. I have a script which uses the following lines to accept and install the JRE: echo "sun-java6-bin shared/accepted-sun-dlj-v1-1 boolean true" | debconf-set-selections apt-get install -y sun-java6-jre This works fine when executing the script locally. However, I need to execute the script remotely using the ssh command, e.g.: ssh -i keyFile root@hostname './myScript' This doesn't work. In particular, it fails on apt-get install -y sun-java6-jre. It would seem that in spite of me setting the licence agreement to accepted, when run remotely in this manner it is ignored. Despite setting the value to true, I still get prompted to manually accept the agreement when I run this command: ssh -i keyFile root@hostname 'apt-get install -y sun-java6-jre' I suspect it is something to do with environment that is taken care of when running a proper terminal session, but have no idea what to try next to fix it. So, what do I have to do to get this command (and hence my deployment script) to run correctly when executing it remotely? Or is there an alternative way that allows me to install the JRE remotely by another means? Edit 0: I have compared the output of env when executed remotely via ssh and when executed via a local terminal session. The only difference between the outputs is that the local terminal session has the additional value TERM=xterm.

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• Issue configuring Oracle database for SSL

  - by Santhosha Kaldambe

  Hello, I want to setup Oracle for SSL communication. I am not using SSL authentication for database user. As first requirement, generated self signed certificate using OpenSSL and added certificate to wallet. The wallet location is specified in server configuration. Created listener and it is starting however it does not provide any service. The default listener (non SSL) is working fine. When I execute LSNRCTL.EXE status SSLLISTENER it gives below output. STATUS of the LISTENER Alias SSLLISTENER Version TNSLSNR for 32-bit Windows: Version 11.1.0.6.0 - Production Start Date 14-NOV-2009 01:47:08 Uptime 16 days 22 hr. 14 min. 3 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File C:\app\Administrator\product\11.1.0\db_1\network\admin\listener.ora Listener Log File c:\app\administrator\diag\tnslsnr\\ssllistener\alert\log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=)(PORT =2484))) The listener supports no services The command completed successfully Here is exact content of various files after configuration. 1) File Name: tnsnames.ora ORCL = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT 1521)) ) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) 2) File Name: sqlnet.ora SSL_VERSION = 0 NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT) sqlnet.authentication_services= (NONE) tcp.validnode_checking = no tcp.invited_nodes=(PS0803.oraebs.com,PS2948,PS5098) SSL_CLIENT_AUTHENTICATION = FALSE WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = C:\app\Administrator\admin\orcl\Server_Wallet) ) ) 3) File Name: listener.ora SSL_CLIENT_AUTHENTICATION = FALSE WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = C:\app\Administrator\admin\orcl\Server_Wallet) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) ) (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT 1521)) ) ) SSLLISTENER = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCPS)(HOST = )(PORT = 2484)) ) Thanks Santhosh

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